Where is the string?

SELECT * FROM gallery2 WHERE topic_id="754564" UNION SELECT * FROM gallery2 WHERE topic_id="641135" UNION SELECT * FROM gallery2 WHERE topic_id="1786675" UNION SELECT * FROM gallery2 WHERE topic_id="1406499" UNION SELECT * FROM gallery2 WHERE topic_id="606934" UNION SELECT * FROM gallery2 WHERE topic_id="1237514" UNION SELECT * FROM gallery2 WHERE topic_id="298363" UNION SELECT * FROM gallery2 WHERE topic_id="513183" UNION SELECT * FROM gallery2 WHERE topic_id="895060" UNION SELECT * FROM gallery2 WHERE topic_id="584714" UNION SELECT * FROM gallery2 WHERE topic_id="599681" UNION SELECT * FROM gallery2 WHERE topic_id="501284" UNION SELECT * FROM gallery2 WHERE topic_id="720155" UNION SELECT * FROM gallery2 WHERE topic_id="1222213" UNION SELECT * FROM gallery2 WHERE topic_id="16031" UNION SELECT * FROM gallery2 WHERE topic_id="1805204"